12-111447547-ATGGGGTGGGGTGGGG-ATGGGGTGGGG

Variant names:

• chr12-111447547-ATGGGG-A
• rs111340708
• NM_005475.3:c.1236+24_1236+28delTGGGG

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP6_Very_Strong BA1

The NM_005475.3(SH2B3):​c.1236+24_1236+28delTGGGG variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.475 in 583,428 control chromosomes in the GnomAD database, including 47,682 homozygotes. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.53 (11376 hom., cov: 0)
  • Exomes 𝑓: 0.47 (36306 hom.)
• Consequence: SH2B3 NM_005475.3 intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: 1.00
• Publications: 7 publications found

Genes affected

SH2B3 (HGNC:29605): (SH2B adaptor protein 3) This gene encodes a member of the SH2B adaptor family of proteins, which are involved in a range of signaling activities by growth factor and cytokine receptors. The encoded protein is a key negative regulator of cytokine signaling and plays a critical role in hematopoiesis. Mutations in this gene have been associated with susceptibility to celiac disease type 13 and susceptibility to insulin-dependent diabetes mellitus. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2014]

ATXN2 (HGNC:10555): (ataxin 2) This gene belongs to a group of genes that is associated with microsatellite-expansion diseases, a class of neurological and neuromuscular disorders caused by expansion of short stretches of repetitive DNA. The protein encoded by this gene has two globular domains near the N-terminus, one of which contains a clathrin-mediated trans-Golgi signal and an endoplasmic reticulum exit signal. The encoded cytoplasmic protein localizes to the endoplasmic reticulum and plasma membrane, is involved in endocytosis, and modulates mTOR signals, modifying ribosomal translation and mitochondrial function. The N-terminal region of the protein contains a polyglutamine tract of 14-31 residues that can be expanded in the pathogenic state to 32-200 residues. Intermediate length expansions of this tract increase susceptibility to amyotrophic lateral sclerosis, while long expansions of this tract result in spinocerebellar ataxia-2, an autosomal-dominantly inherited, neurodegenerative disorder. Genome-wide association studies indicate that loss-of-function mutations in this gene may be associated with susceptibility to type I diabetes, obesity and hypertension. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2016]

ATXN2 Gene-Disease associations (from GenCC):

• spinocerebellar ataxia type 2

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Benign. The variant received -16 ACMG points.

• BP6: Variant 12-111447547-ATGGGG-A is Benign according to our data. Variant chr12-111447547-ATGGGG-A is described in ClinVar as Benign. ClinVar VariationId is 1250838.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.867 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SH2B3	NM_005475.3	c.1236+24_1236+28delTGGGG		intron_variant	Intron 6 of 7	ENST00000341259.7	NP_005466.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SH2B3	ENST00000341259.7	c.1236+4_1236+8delTGGGG		splice_region_variant, intron_variant	Intron 6 of 7	1	NM_005475.3	ENSP00000345492.2
SH2B3	ENST00000538307.1	c.630+4_630+8delTGGGG		splice_region_variant, intron_variant	Intron 5 of 6	2		ENSP00000440597.1
ATXN2	ENST00000642389.2	n.*171-3365_*171-3361delCCCCA		intron_variant	Intron 26 of 26			ENSP00000496055.2

Frequencies

GnomAD3 genomes AF: 0.531 AC: 47291 AN: 89144 Hom.: 11344 Cov.: 0

Gnomad AFR AF: 0.709

Gnomad AMI AF: 0.296

Gnomad AMR AF: 0.518

Gnomad ASJ AF: 0.242

Gnomad EAS AF: 0.891

Gnomad SAS AF: 0.510

Gnomad FIN AF: 0.461

Gnomad MID AF: 0.565

Gnomad NFE AF: 0.364

Gnomad OTH AF: 0.508

GnomAD2 exomes AF: 0.346 AC: 63891 AN: 184788 AF XY: 0.331

Gnomad AFR exome AF: 0.652

Gnomad AMR exome AF: 0.432

Gnomad ASJ exome AF: 0.142

Gnomad EAS exome AF: 0.815

Gnomad FIN exome AF: 0.182

Gnomad NFE exome AF: 0.227

Gnomad OTH exome AF: 0.322

GnomAD4 exome AF: 0.465 AC: 229884 AN: 494160 Hom.: 36306 AF XY: 0.454 AC XY: 117651 AN XY: 258960

African (AFR) AF: 0.687 AC: 13390 AN: 19478

American (AMR) AF: 0.450 AC: 11689 AN: 25996

Ashkenazi Jewish (ASJ) AF: 0.268 AC: 2416 AN: 9024

East Asian (EAS) AF: 0.840 AC: 29810 AN: 35494

South Asian (SAS) AF: 0.451 AC: 23811 AN: 52842

European-Finnish (FIN) AF: 0.298 AC: 8442 AN: 28312

Middle Eastern (MID) AF: 0.516 AC: 1761 AN: 3410

European-Non Finnish (NFE) AF: 0.429 AC: 127033 AN: 296078

Other (OTH) AF: 0.490 AC: 11532 AN: 23526

GnomAD4 genome AF: 0.531 AC: 47383 AN: 89268 Hom.: 11376 Cov.: 0 AF XY: 0.539 AC XY: 22796 AN XY: 42322

African (AFR) AF: 0.709 AC: 21940 AN: 30926

American (AMR) AF: 0.518 AC: 4292 AN: 8286

Ashkenazi Jewish (ASJ) AF: 0.242 AC: 388 AN: 1606

East Asian (EAS) AF: 0.890 AC: 3791 AN: 4258

South Asian (SAS) AF: 0.509 AC: 1378 AN: 2706

European-Finnish (FIN) AF: 0.461 AC: 1547 AN: 3358

Middle Eastern (MID) AF: 0.560 AC: 103 AN: 184

European-Non Finnish (NFE) AF: 0.364 AC: 13207 AN: 36316

Other (OTH) AF: 0.505 AC: 617 AN: 1222

Alfa AF: 0.129 Hom.: 272

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

-

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Nov 21, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 06, 2020

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Benign:1

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.0
Mutation Taster		=97/3	polymorphism (auto)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs111340708; hg19: chr12-111885351;